{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{2}{c}}
\hline\hline
          &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         \\
\hline
1.S#1.T   &   -0.018\sym{***}&    0.004         \\
          &  (0.003)         &  (0.006)         \\
\hline
\(N\)     &    17704         &    17704         \\
\(R^{2}\) &    0.796         &    0.434         \\
\hline\hline
\end{tabular}
}
